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23 Episodes 2013 - 2014
The sixth season of this crime drama opens with Beckett (Stana Katic) accepting a marriage proposal from Castle (Nathan Fillion). However, their road to the altar gets a little bumpy when Beckett also accepts a new high-profile job in Washington, D.C. Meanwhile, things don't go smoothly for Castle and Alexis (Molly Quinn) when he doesn't approve of the new boyfriend she's brought home from Costa Rica. Castle gets a glimpse at what parenthood would be like a second time when he and Beckett temporarily care for a baby who was carried into a church by a man dying from gunshot wounds. And Ryan (Seamus Dever) and his wife excitedly prepare for their first child, but she goes into labor while Ryan is investigating a dangerous arson case.
Episode 1
Mon, Sep 23, 2013 60 mins
In the sixth-season opener, Castle and Beckett deal with the fallout from their personal choices as a high-stakes investigation unfolds.
Episode 2
Mon, Sep 30, 2013 60 mins
Beckett rushes to track down a deadly stolen toxin before it causes massive casualties. However, Castle has been exposed to it already and is in danger of dying.
Episode 3
Mon, Oct 7, 2013 60 mins
The squad investigates the homicide of a former child star from the 1990s, but soon the case is unexpectedly hijacked by Feds McCord and Beckett. Meanwhile, a new detective begins working at the squad.
Episode 4
Mon, Oct 14, 2013 60 mins
A young woman suspected of murder takes hostages and demands to negotiate only with Castle.
Episode 5
Mon, Oct 21, 2013 60 mins
A murder suspect claims he's a time traveler from the future who's trying to prevent disastrous events from happening.
Episode 6
Mon, Oct 28, 2013 60 mins
A woman's body is discovered ritually posed, and odd symbols turn up in her apartment. Soon, a monk becomes the prime murder suspect, and Castle thinks there is a conspiracy at work. Meanwhile, Castle struggles to accept Alexis' new living arrangements.
Episode 7
Mon, Nov 4, 2013 60 mins
Alexis believes that a death-row inmate was wrongly convicted, so she seeks investigative assistance from her dad. However, they only have 72 hours to reexamine the original murder case before the inmate's scheduled execution.
Episode 8
Mon, Nov 11, 2013 60 mins
As Castle and Beckett investigate the homicide of a popular relationship therapist, their theory for the motive for her murder shifts: The killer may not have sought her high-profile client list, but instead wanted a rare, pricey object she possessed.
Episode 9
Mon, Nov 18, 2013 60 mins
Castle and Beckett investigate a homicide in which the victim strongly resembles Lanie, and soon the team believe that members of the 12th Precinct are the killer's next targets.
Episode 10
Mon, Nov 25, 2013 60 mins
Castle and Beckett look after a baby boy given to a priest by a dying man who stumbled into a church. Their investigation reveals that the infant was not related to the murdered man, and finding the baby's parents proves difficult.
Episode 11
Mon, Jan 6, 2014 60 mins
A body is found in a building fire, but the cause of death turns out to be a gunshot wound, so Castle and Beckett search for a serial arsonist who's also an armed killer. Meanwhile, Ryan's wife prepares to deliver their baby.
Episode 12
Mon, Jan 13, 2014 60 mins
The investigation of a video-store clerk's homicide reveals that the victim was a skilled hacker, and that Castle's father is connected to the case.
Episode 13
Mon, Jan 20, 2014 60 mins
A rising pop star's body is discovered in an alley, which leads Castle and Beckett to investigate the singer's wild lifestyle. However, they're not prepared for the alarming revelation that surfaces.
Episode 14
Mon, Feb 3, 2014 60 mins
The assistant to a ruthless fashion editor is killed, leading Castle and Beckett into the high-stakes world of high fashion. Meanwhile, Beckett's background in modeling grants her access to a special surprise for her wedding.
Episode 15
Mon, Feb 17, 2014 60 mins
A high-school mean girl is killed, and the prime suspect is a fellow student who may possess telekinetic powers.
Episode 16
Mon, Feb 24, 2014 60 mins
Multiple people confess to the murder of a struggling actor, and each expresses sincerity and provides details about the homicide, adding mystery and complexity to the case.
Episode 17
Mon, Mar 3, 2014 60 mins
Beckett lands in danger when she goes undercover to assist with a narcotics investigation. As she battles wits with threatening underworld figures, she encounters an adversary from her past.
Episode 18
Mon, Mar 17, 2014 60 mins
Castle and Beckett are pursued by a ninja assassin while investigating the homicide of a Japanese ballerina.
Episode 19
Mon, Mar 24, 2014 60 mins
A Wall Street trader's homicide is investigated, but the case takes a surprising turn when it's revealed that the victim was doing undercover work for Gates' estranged sister, who's a U.S. attorney.
Episode 20
Mon, Apr 21, 2014 60 mins
The body of a mobster who vanished in the 1970s is found by construction workers, and Beckett and Castle must deal with a murder witness who believes it's still the 1970s.
Episode 21
Mon, Apr 28, 2014 60 mins
A promising professional skateboarder is killed by a motorcyclist, so Castle and Beckett dive into the world of extreme sports to investigate the murder.
Episode 22
Mon, May 5, 2014 60 mins
Beckett jeopardizes her life and Castle's when she conducts a secret investigation linked to her mother's homicide.
Episode 23
Mon, May 12, 2014 60 mins
In the sixth-season finale, Castle and Beckett prepare for their wedding. However, an unwelcome surprise may ruin things, so they embark on a zany adventure, encountering masked men and mad bikers along the way.